[oe] "krb" fails to build, suspect GCC bug

[Khem Raj]

On Tue, Oct 27, 2015 at 11:21 AM, Martin Jansa <martin.jansa at gmail.com> wrote:
> On Sat, Sep 05, 2015 at 02:39:14PM +0200, Mike Looijmans wrote:
>> I got this weird build failure from the "krb" package:
>>
>> | make[3]: Entering directory
>> '/TOPDIR/build/tmp/work/mips32el-oe-linux/krb5/1.13.2-r0/krb5-1.13.2/src/lib/krb5/ccache'
>> | mipsel-oe-linux-gcc  -mel -mabi=32 -mhard-float -march=mips32
>> --sysroot=/TOPDIR/build/tmp/sysroots/formuler1 -fPIC -DSHARED
>> -DHAVE_CONFIG_H  -I../../../include -I../../../include -I./ccapi -I. -I.
>>   -DKRB5_DEPRECATED=1 -DKRB5_PRIVATE  -Os -pipe -g
>> -feliminate-unused-debug-types -DDESTRUCTOR_ATTR_WORKS=1
>> -I/TOPDIR/build/tmp/sysroots/formuler1/usr/include/et -Wall -Wcast-align
>> -Wshadow -Wmissing-prototypes -Wno-format-zero-length -Woverflow
>> -Wstrict-overflow -Wmissing-format-attribute -Wmissing-prototypes
>> -Wreturn-type -Wmissing-braces -Wparentheses -Wswitch -Wunused-function
>> -Wunused-label -Wunused-variable -Wunused-value -Wunknown-pragmas
>> -Wsign-compare -Werror=uninitialized -Werror=pointer-arith
>> -Werror=declaration-after-statement
>> -Werror-implicit-function-declaration -pthread -c cc_file.c -o
>> cc_file.so.o && mv -f cc_file.so.o cc_file.so
>> | cc_file.c: In function 'fcc_next_cred':
>> | cc_file.c:368:9: error: 'maxsize' may be used uninitialized in this
>> function [-Werror=maybe-uninitialized]
>> |      ret = load_data(context, id, maxsize, buf);
>> |          ^
>> | cc_file.c:1091:12: note: 'maxsize' was declared here
>> |      size_t maxsize;
>> |             ^
>> | cc1: some warnings being treated as errors
>>
>> Looking at the source, this doesn't make any sense at all. The
>> declaration of the variable isn't even in the same method body. And the
>> line it complains about is about the fifth time it passes that variable
>> to another method.
>>
>> And working around it by initializing maxsize=0 just makes the compiler
>> choke on a similar situation elsewhere:
>> | packet.c:50:67: error: 'id' may be used uninitialized in this function
>>
>>
>> I suspect the problem here is GCC and not the krb code. Anyone seen this?
>
> I've seen it today in my world builds, It seems to fail only when building with -Os.
>
> I've seen similar issue in mdadm, also only with -Os.
>

is this regression ? or seen for first time?

> --
> Martin 'JaMa' Jansa     jabber: Martin.Jansa at gmail.com
>
> --
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